2 Answers
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Perhaps in spite of Aesop's fable they might be understood, but only as long as the users are familiar with rabbits and turtles and their relative speeds IRL. You also have to keep in mind that some cultures hold various animals in either very high regard, or as despicable and unclean, and you wouldn't want that to influence the way your users experience your site/app/whatever-the-context-is. I don't know the specifics for all cultures + turtles and rabbits, so you'd want to do user testing for sure.

Same as a Honda lawnmower. Turtle and Rabbit.
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Bart GijssensSep 27 '13 at 9:33

1

Same as Endomondo sports tracker app - your fastest split for a run or a bike ride marks the time with a rabbit icon, and your slowest split's time is marked with a turtle icon.
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LindaBrammerSep 27 '13 at 14:17